Commit 67a37308 authored by Jean Delvare's avatar Jean Delvare Committed by Jean Delvare
Browse files

hwmon: (dme1737) Convert to a new-style i2c driver 



The new-style dme1737 driver implements the optional detect() callback
to cover the use cases of the legacy driver. I don't actually expect
any new-style device for that driver, but as the old i2c API is going
away soon, we have to switch to the new one.

Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
Cc: Juerg Haefliger <juergh@gmail.com>
parent dbc2bc25

drivers/hwmon/dme1737.c

+48 −58
Original line number Diff line number Diff line
@@ -176,7 +176,6 @@ static const u8 DME1737_BIT_ALARM_FAN[] = {10, 11, 12, 13, 22, 23}; 
 * --------------------------------------------------------------------- */



struct dme1737_data {

	struct i2c_client _client;	/* will go away soon */

	struct i2c_client *client;	/* for I2C devices only */

	struct device *hwmon_dev;

	const char *name;
@@ -2188,38 +2187,24 @@ exit: 
	return err;

}



static int dme1737_i2c_detect(struct i2c_adapter *adapter, int address,

			      int kind)

/* Return 0 if detection is successful, -ENODEV otherwise */

static int dme1737_i2c_detect(struct i2c_client *client, int kind,

			      struct i2c_board_info *info)

{

	struct i2c_adapter *adapter = client->adapter;

	struct device *dev = &adapter->dev;

	u8 company, verstep = 0;

	struct i2c_client *client;

	struct dme1737_data *data;

	struct device *dev;

	int err = 0;

	const char *name;



	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {

		goto exit;

	}



	if (!(data = kzalloc(sizeof(struct dme1737_data), GFP_KERNEL))) {

		err = -ENOMEM;

		goto exit;

		return -ENODEV;

	}



	client = &data->_client;

	data->client = client;

	i2c_set_clientdata(client, data);

	client->addr = address;

	client->adapter = adapter;

	client->driver = &dme1737_i2c_driver;

	dev = &client->dev;



	/* A negative kind means that the driver was loaded with no force

	 * parameter (default), so we must identify the chip. */

	if (kind < 0) {

		company = dme1737_read(data, DME1737_REG_COMPANY);

		verstep = dme1737_read(data, DME1737_REG_VERSTEP);

		company = i2c_smbus_read_byte_data(client, DME1737_REG_COMPANY);

		verstep = i2c_smbus_read_byte_data(client, DME1737_REG_VERSTEP);



		if (company == DME1737_COMPANY_SMSC &&

		    (verstep & DME1737_VERSTEP_MASK) == DME1737_VERSTEP) {
@@ -2228,8 +2213,7 @@ static int dme1737_i2c_detect(struct i2c_adapter *adapter, int address, 
			   verstep == SCH5027_VERSTEP) {

			kind = sch5027;

		} else {

			err = -ENODEV;

			goto exit_kfree;

			return -ENODEV;

		}

	}
@@ -2239,33 +2223,44 @@ static int dme1737_i2c_detect(struct i2c_adapter *adapter, int address, 
		kind = dme1737;

		name = "dme1737";

	}

	data->type = kind;



	/* Fill in the remaining client fields and put it into the global

	 * list */

	strlcpy(client->name, name, I2C_NAME_SIZE);

	data->name = client->name;

	mutex_init(&data->update_lock);



	/* Tell the I2C layer a new client has arrived */

	if ((err = i2c_attach_client(client))) {

		goto exit_kfree;

	}



	dev_info(dev, "Found a %s chip at 0x%02x (rev 0x%02x).\n",

		 kind == sch5027 ? "SCH5027" : "DME1737", client->addr,

		 verstep);

	strlcpy(info->type, name, I2C_NAME_SIZE);



	return 0;

}



static int dme1737_i2c_probe(struct i2c_client *client,

			     const struct i2c_device_id *id)

{

	struct dme1737_data *data;

	struct device *dev = &client->dev;

	int err;



	data = kzalloc(sizeof(struct dme1737_data), GFP_KERNEL);

	if (!data) {

		err = -ENOMEM;

		goto exit;

	}



	i2c_set_clientdata(client, data);

	data->type = id->driver_data;

	data->client = client;

	data->name = client->name;

	mutex_init(&data->update_lock);



	/* Initialize the DME1737 chip */

	if ((err = dme1737_init_device(dev))) {

		dev_err(dev, "Failed to initialize device.\n");

		goto exit_detach;

		goto exit_kfree;

	}



	/* Create sysfs files */

	if ((err = dme1737_create_files(dev))) {

		dev_err(dev, "Failed to create sysfs files.\n");

		goto exit_detach;

		goto exit_kfree;

	}



	/* Register device */
@@ -2280,45 +2275,40 @@ static int dme1737_i2c_detect(struct i2c_adapter *adapter, int address, 


exit_remove:

	dme1737_remove_files(dev);

exit_detach:

	i2c_detach_client(client);

exit_kfree:

	kfree(data);

exit:

	return err;

}



static int dme1737_i2c_attach_adapter(struct i2c_adapter *adapter)

{

	if (!(adapter->class & I2C_CLASS_HWMON)) {

		return 0;

	}



	return i2c_probe(adapter, &addr_data, dme1737_i2c_detect);

}



static int dme1737_i2c_detach_client(struct i2c_client *client)

static int dme1737_i2c_remove(struct i2c_client *client)

{

	struct dme1737_data *data = i2c_get_clientdata(client);

	int err;



	hwmon_device_unregister(data->hwmon_dev);

	dme1737_remove_files(&client->dev);



	if ((err = i2c_detach_client(client))) {

		return err;

	}



	kfree(data);

	return 0;

}



static const struct i2c_device_id dme1737_id[] = {

	{ "dme1737", dme1737 },

	{ "sch5027", sch5027 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, dme1737_id);



static struct i2c_driver dme1737_i2c_driver = {

	.class = I2C_CLASS_HWMON,

	.driver = {

		.name = "dme1737",

	},

	.attach_adapter	= dme1737_i2c_attach_adapter,

	.detach_client = dme1737_i2c_detach_client,

	.probe = dme1737_i2c_probe,

	.remove = dme1737_i2c_remove,

	.id_table = dme1737_id,

	.detect = dme1737_i2c_detect,

	.address_data = &addr_data,

};



/* ---------------------------------------------------------------------

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